<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        .box {
            position: relative;
            width: 100%;
            height: 463px;
            border: 1px solid blue;
        }

        .small-box {
            position: absolute;
            top: 45%;
            left: 65%;
            transform: translate(-50%, -50%);
            width: 350px;
            height: 350px;
            background-color: yellow;
            z-index: 1;
        }

        .background {
            position: absolute;
            width: 100%;
            object-fit: cover;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="content">
            <div class="small-box"></div>
            <div class="background">
                <img src="/img/登录/login-1.png" alt="" width="100%">
            </div>
        </div>
    </div>
</body>

</html>